Observation of Superheavy Nuclei Produced in the Reaction of K[number sign]^{86r with P[number sign]208b}

Journal Article · Sat Jul 31 20:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.83.1104· OSTI ID:6325700

Ninov, V; Gregorich, K E; Ghiorso, A; Hoffman, D C; Lee, D M; Nitsche, H; Swiatecki, W J; Kirbach, U W; Laue, C A; Adams, J L; Patin, J B; Shaughnessy, D A; Strellis, D A; Wilk, P A ^[1]; Loveland, W ^[2]; Hoffman, D C; Nitsche, H; Adams, J L; Patin, J B; Shaughnessy, D A ; Wilk, P A ^[3]

---

1. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
2. Department of Chemistry, Oregon State University, Corvallis, Oregon 97331 (United States)
3. Department of Chemistry, University of California, Berkeley, California 94720 (United States)

Following a prediction by Smola[acute n]czuk [Phys. Rev. C [bold 59], 2634 (1999)], we searched for superheavy element formation in the bombardment of [sup 208]Pb with 449-MeV [sup 86]Kr ions. We have observed three decay chains, each consisting of an implanted heavy atom and six subsequent [alpha] decays, correlated in time and position. In these decay chains, a rapid (ms) sequence of high energy [alpha] particles (E[sub [alpha]][ge]10 MeV ) indicates the decay of a new high-Z element. The observed chains are consistent with the formation of [sup 293]118 and its decay by sequential [alpha] -particle emission to [sup 289]116 , [sup 285]114 , [sup 281]112 , [sup 277]110 , [sup 273]Hs (Z=108 ) and [sup 269]Sg (Z=106 ). The production cross section is 2.2[sup +2.6][sub [minus]0.8] pb . [copyright] [ital 1999] [ital The American Physical Society ]

• DOE Contract Number: AC03-76SF00098; FG06-88ER40402
• OSTI ID: 6325700
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 83:6; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
BEAMS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DECAY
ELEMENTS
FLUIDS
GASES
HEAVY ION REACTIONS
HEAVY NUCLEI
ION BEAMS
KRYPTON
KRYPTON 86 BEAMS
LEAD
LEAD 208 TARGET
METALS
NONMETALS
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
RARE GASES
TARGETS